Different models of consciousness subscribe to different notions of explanation, use different tools, and aim to explain different phenomena, making direct comparison difficult. A framework is presented that compares models along three minimal dimensions: mode of explanation, mechanisms of explanation, and target of explanation. The approach may help identify driving assumptions, theoretical commitments, and experimental predictions, and points toward more integrative theoretical research where axiomatic models could resolve current contradictions.
Heautoscopy is a rare experience where a person sees a double of their own body while feeling uncertain about where their self is located and sensing that the illusory body belongs to them. It occurs in diverse conditions like schizophrenia, brain tumors, migraine, epilepsy, and depression. A review of over 140 case studies found only 9 that met strict criteria for heautoscopy, distinguishing it from similar phenomena such as autoscopy and out-of-body experiences, which are often mislabeled. From the patient's perspective, heautoscopy feels like a bodily illusion rather than a false belief. The sense of being in two places at once arises from shifting self-location and expanded body ownership, not from having two viewpoints. The phenomenon offers insight into how the brain constructs bodily boundaries and spatial perspective.